CN1314748C - Process for preparing permanent magnet iron oxygen body polymer composite magnet - Google Patents
Process for preparing permanent magnet iron oxygen body polymer composite magnet Download PDFInfo
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- CN1314748C CN1314748C CNB2005100345582A CN200510034558A CN1314748C CN 1314748 C CN1314748 C CN 1314748C CN B2005100345582 A CNB2005100345582 A CN B2005100345582A CN 200510034558 A CN200510034558 A CN 200510034558A CN 1314748 C CN1314748 C CN 1314748C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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Abstract
The present invention relates to a method for preparing a composite magnetic body of permanent magnetic ferrite polymers, which comprises: magnetic powder is added to a polymer solution, and thus, monomers generate in-situ polymerization reaction on the surface of the magnetic powder to generate polymers; thus, the magnetic powder and the polymers as binding agents are uniformly mixed; then, the mixture of the magnetic powder and the binding agents are extruded and formed by a double screw extruder or a single screw extruder, and as a result, the mixing of the magnetic powder and the binding agents, and the forming of the magnetic body are continuously accomplished. The method simplifies preparation technology, cancels a mixing smelting technology and a granulating technology and saves the investment of mixing smelting and granulating equipment. The present invention realizes the sufficient and uniform mixing of the magnetic powder and the polymers as the binding agents by the technique of in-situ polymerization reaction. Thus, the present invention solves the problem that the magnetic powder and the polymers are very difficultly uniformly mixed due to large specific density deviation when directly mixed and overcomes the defect that the polymers and the magnetic powder have high technological requirement for mixing equipment, low mixing efficiency, etc. when directed mixed.
Description
Technical field
The present invention relates to magnet forming processing technology field, specifically be meant a kind of preparation method of permanent magnet iron oxygen body polymer composite magnet.
Background technology
Bonded permanent magnet is with magnetic and resin or macromolecular material is mixing or with the magnetic coating, with compression molding, injection moulding, rolling process and extrusion molding etc. it is prepared into final size and shape then, makes after solidifying.Because will contain the binding agent of some amount in the bonded permanent magnet, these binding agents are nonmagnetic substance, thus the density of bonded permanent magnet low than sintered magnet, thus its magnetic is lower than sintered magnet.Bonded permanent magnet because have that cost is low, dimensional precision is high, freedom shape is big, physical strength is good, light specific gravity, can automatic production in enormous quantities continuously, the production efficiency height, advantages such as good product consistency, industry, agricultural, military affairs, science and technology, medical science, life all respects have been widely used in, the spindle motor of for example a large amount of miniature precision electric motors that use, stepper-motor, hard disk drive etc.Wherein, bonded permanent magnet accounts for 94% of ultimate production in the application quantity maximum of rotary device (mainly being the micromotor that computer is used).
Bonded ferrite permanent magnetism is to be the permanent magnet material that magnetic body and binding agent process with the ferrite permanent-magnet powder, also claims composite permanet magnet or rubber-plastic magnet.It has magnetic properties preferably, has the favorable mechanical performance again.Bonded ferrite permanent magnetism is compared with alloy permanent magnetism, and technology is simple, and cost is low; Compare with ferrite sintered body permanent magnetism, bonded permanent ferrite, particularly high-performance anisotropic bond permanent-magnet ferrite is because its good mechanical property, need not carry out post-treatment and just can obtain high dimensional accuracy, can prepare complicated shape and ring-type product as thin as a wafer, and can be continuously advantage such as automatic production in enormous quantities and being developed rapidly, be widely used in industry and field of consumer electronics such as computer, mobile communication, senior audio and video equipment, small and special electric machine, transmitter and magneto-electric instrument, office equipment, electronic watch, Electrofax.The production technique of current domestic bonded ferrite permanent magnetism comprises compressed moulding method, injection moulding and extruding (calendering) method of forming.
Binding magnet oxysome permanent magnet mainly comprises rigidity bonded permanent magnet and flexible adhesion magnet two big classes, and isotropy bonded ferrite permanent magnetism mainly is used in colour TV and converges sheet, the magnetic stripe of refrigerator gasket or other envelope usefulness and the magnetic sheet of various uses.Since 1986, the market requirement of China's bonded ferrite permanent magnetism will be paid special attention to development and the exploitation of micromotor with magnetic rubber-plastic strip, from present developments, the magnet steel majority of special micromotor all adopts flexible good rubber magnetic stripe, replaces the sintering magnet ring and the injection magnet ring that use in the past.Because rubber magnetic stripe consistency of performance is good, produce easy to assemblyly, development prospect is widely arranged.
The preparation method of the at present disclosed bonded ferrite permanent magnetism of being made by permanent-magnet ferrite powder and polymer materials is as follows: at first with coupling agent the permanent-magnet ferrite powder is carried out surface treatment; then with magnetic and polymkeric substance in high-speed mixer and mixing; utilize mill to carry out the mixing sheet material of making again, magnetic sheet utilizes the method for rolling or extruding to make built-up magnet be cut into particle in dicing machine after.
There is following deficiency in prior art: carry out forming process after (1) prior art all adopts permanent magnetic ferrite magnetic powder and polymkeric substance directly mixes, because the difference of magnetic and polymkeric substance proportion, in order to make two kinds of material mixing even, must carry out Forced Mixing, to mixing equipment and processing requirement height, mixing efficiency is low, and the homogeneity of magnetic and mixed with polymers is subjected to certain limitation; (2) prior art all adopts the preparation technology of magnetic mixed with polymers → mixing → granulation → moulding, complex technical process; (3) form of mainly utilizing coupling agent to pass through chemical bond between inorganic oxide magnetic and the organic binder bond combines, and bonding strength is restricted, and also can exert an influence to blended homogeneity between magnetic and the binding agent.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, and a kind of preparation method of permanent magnet iron oxygen body polymer composite magnet is provided.
The present invention is achieved through the following technical solutions:
The preparation method of described a kind of permanent magnet iron oxygen body polymer composite magnet comprises the steps and processing condition:
The first step in mass fraction, mixes the back thorough drying with 3～6 parts coupling agents and 100 parts of strontium ferrite magnetic powders, magnetic is carried out the surface coat processing;
In second step, in mass fraction, fine or 7～8 parts of dibenzoyl peroxide join in 100 parts of polymer monomers with 6～7 parts of azo two isobutyls, make monomer solution; And with 10 parts of monomer solutions with handle through the first step after strontium ferrite magnetic powder mix for 90 parts, make suspension system, then suspension system is heated to 65～100 ℃ in nitrogen, be incubated 4～8 hours, make monomer home position polymerization reaction take place and generate polymkeric substance, realize the uniform mixing of magnetic and polymkeric substance on the magnetic surface;
The 3rd step, utilize magnetic under 1000kA/m alignment magnetic field effect the directly extrusion moulding of twin screw or single screw extruder with polymer overmold, prepare described permanent magnetic ferrite magnetic powder polymkeric substance built-up magnet.
Described coupling agent comprises silane resin acceptor kh-550, KH-560, KH-570; Described polymer monomer comprises methyl methacrylate, methyl methacrylate glycidyl ester, butyl acrylate, vinylbenzene.
In order to realize the present invention better, the preparation method of described permanent magnet iron oxygen body polymer composite magnet comprised in second step: (1) is in mass fraction, 6～7 parts of dibenzoyl peroxide are joined in 100 parts of methyl methacrylates, make methyl methacrylate monomer solution; (2) 10 parts of monomer solutions are mixed for 90 parts with the strontium ferrite magnetic powder that passes through after the first step is handled, make suspension system; (3) suspension system is heated to 90～100 ℃ in nitrogen, is incubated 6～8 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethylmethacrylate on the magnetic surface.
The preparation method of described permanent magnet iron oxygen body polymer composite magnet can also comprise in second step: (1) with 6～7 parts of fine joining in 100 parts of methyl methacrylate glycidyl ester monomer of azo two isobutyls, makes monomer solution in mass fraction; (2) 10 parts of monomer solutions are mixed for 90 parts with the strontium ferrite magnetic powder that passes through after the first step is handled, make suspension system; (3) suspension system is heated to 70～80 ℃ in nitrogen, is incubated 5～7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethylmethacrylate glycidyl ester on the magnetic surface.
The preparation method second another kind of conversion of step of described permanent magnet iron oxygen body polymer composite magnet comprises: (1) in mass fraction, joins in 100 parts of butyl acrylates in the monomer 6～7 parts of azo two isobutyls are fine, makes monomer solution; (2) 10 parts of monomer solutions are mixed for 90 parts with the strontium ferrite magnetic powder that passes through after the first step is handled, make suspension system; (3) then suspension system is heated to 65～80 ℃ in nitrogen, is incubated 4～5 hours, make Butyl Acrylate Monomer generate butyl polyacrylate in the polymerization of magnetic surface in situ.
Preparation method's second another conversion of step of described permanent magnet iron oxygen body polymer composite magnet comprises: (1) joins 7～8 parts of dibenzoyl peroxide in 100 parts of styrene monomers in mass fraction, makes monomer solution; (2) 10 parts of monomer solutions are mixed for 90 parts with the strontium ferrite magnetic powder that passes through after the first step is handled, make suspension system; (3) then suspension system is heated to 90～100 ℃ in nitrogen, is incubated 5～6 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.
The present invention compared with prior art has following advantage and beneficial effect:
(1) the present invention with magnetic and polymer monomer uniform mixing after, utilize the home position polymerization reaction technology, polymkeric substance as binding agent is generated at the permanent magnetic ferrite magnetic powder surface in situ, make the surface of every magnetic coated equably polymer layer, and after finishing, reaction utilize twin screw (single screw rod) forcing machine directly with the extrusion moulding of magnetic binder mixtures, the mixing of magnetic binding agent, magnet moulding are finished continuously, simplified preparation technology, omit mixing, granulation process, saved mixing, granulating equipment investment;
(2) the present invention utilizes the home position polymerization reaction technology, realize that magnetic mixes with the full and uniform of polymkeric substance as binding agent, fundamentally solved when polymkeric substance directly mixed with magnetic, because the proportion deviation of magnetic and polymkeric substance is big, the problem that is very difficult to mix, when having overcome polymkeric substance and directly having mixed with magnetic to mixing equipment and processing requirement height, shortcoming such as mixing efficiency is low.
Embodiment
Below in conjunction with embodiment, the present invention is done detailed description further, but embodiments of the present invention are not limited thereto.
Embodiment 1
In mass fraction, 3 parts KH550 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently,, 6 parts of dibenzoyl peroxide are joined in 100 parts of methyl methacrylate monomers, make methyl methacrylate monomer solution in mass fraction; 10 parts of monomer solutions are mixed with 90 parts of strontium ferrite magnetic powders after previous step is handled, make suspension system, then suspension system is heated to 90 ℃ in nitrogen, is incubated 8 hours, make methyl methacrylate monomer generate polymethylmethacrylate in magnetic generation surface in situ polyreaction.At last, utilize twin screw extruder, prepare described strontium ferrites powder-polymethylmethacrylate built-up magnet 190 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that polymethylmethacrylate is coated.After testing, the maximum magnetic energy product of prepared built-up magnet is 8.6kJ/m
3
Embodiment 2
In mass fraction, 6 parts KH550 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing; Subsequently, in mass fraction, azo two isobutyls that add 7 parts in 100 parts of methyl methacrylate glycidyl ester monomer are fine, make methyl methacrylate glycidyl ester monomer liquation; And with 10 parts monomer solution with mix with 90 parts of strontium ferrite magnetic powders after previous step is handled, make suspension system; Suspension system is heated to 70 ℃ in nitrogen, is incubated 7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethylmethacrylate glycidyl ester on the magnetic surface.At last, utilize single screw extrusion machine 130 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that the polymethylmethacrylate glycidyl ester is coated, prepare described strontium ferrites powder-polymethylmethacrylate glycidyl ester built-up magnet.After testing, the maximum magnetic energy product of prepared built-up magnet is 7.2kJ/m
3
Embodiment 3
In mass fraction, 5 parts KH550 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently, in mass fraction, azo two isobutyls that add 6 parts in 100 parts of butyl acrylates are fine, make the butyl acrylate liquation; 10 parts of solution are mixed with 90 parts of strontium ferrite magnetic powders after previous step is handled, make suspension system; Suspension system is heated to 65 ℃ in nitrogen, is incubated 5 hours, make Butyl Acrylate Monomer generate butyl polyacrylate in the polymerization of magnetic surface in situ.At last, utilize twin screw extruder polymerization to be generated magnetic directly extrusion moulding under the effect of 1000kA/m alignment magnetic field that butyl polyacrylate coats, prepare described strontium ferrites powder-butyl polyacrylate built-up magnet at 120 ℃.After testing, the maximum magnetic energy product of prepared built-up magnet is 7.8kJ/m
3
Embodiment 4
In mass fraction, 6 parts KH560 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently,, in 100 parts of vinylbenzene, add 8 parts dibenzoyl peroxide, make the vinylbenzene liquation in mass fraction; 10 parts of solution are mixed with 90 parts of strontium ferrite magnetic powders handling through previous step, make suspension system; Suspension system is heated to 90 ℃ in nitrogen, is incubated 6 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.At last, utilize single screw extrusion machine, prepare described strontium ferrites powder-polystyrene built-up magnet 190 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that polystyrene is coated.After testing, the maximum magnetic energy product of prepared built-up magnet is 8.2kJ/m
3
Embodiment 5
In mass fraction, 3 parts KH560 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently,, in 100 parts of methyl methacrylates, add 6 parts dibenzoyl peroxide, make the methyl methacrylate monomer liquation in mass fraction; 10 parts of monomer solutions are mixed with 90 parts the strontium ferrite magnetic powder of handling through previous step, make suspension system; Suspension system is heated to 95 ℃ in nitrogen, is incubated 7 hours, make methyl methacrylate monomer generate polymethylmethacrylate in magnetic generation surface in situ polyreaction.At last, utilize twin screw extruder, prepare described strontium ferrites powder-polymethylmethacrylate built-up magnet 190 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that polymethylmethacrylate is coated.
Embodiment 6
In mass fraction, 4 parts KH560 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently, in mass fraction, azo two isobutyls that add 8 parts in 100 parts of methyl methacrylate glycidyl ester monomer are fine, make methyl methacrylate glycidyl ester monomer liquation; 10 parts of monomer solutions and 90 parts of strontium ferrite magnetic powders handling through previous step are mixed, make suspension system; Suspension system is heated to 80 ℃ in nitrogen, is incubated 5 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethylmethacrylate glycidyl ester on the magnetic surface.At last, utilize twin screw extruder 130 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that the polymethylmethacrylate glycidyl ester is coated, prepare described strontium ferrites powder-polymethylmethacrylate glycidyl ester built-up magnet.
Embodiment 7
In mass fraction, 4 parts KH570 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently, in mass fraction, azo two isobutyls that add 7 parts in 100 parts of butyl acrylates are fine, make the butyl acrylate liquation; 10 parts of solution and 90 parts of strontium ferrite magnetic powders handling through previous step are mixed, make suspension system; Suspension system is heated to 80 ℃ in nitrogen, is incubated 4 hours, make Butyl Acrylate Monomer generate butyl polyacrylate in the polymerization of magnetic surface in situ.At last, utilize twin screw extruder, prepare described strontium ferrites powder-butyl polyacrylate built-up magnet 120 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that butyl polyacrylate is coated.
Embodiment 8
In mass fraction, 6 parts KH570 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently,, in 100 parts of vinylbenzene, add 8 parts dibenzoyl peroxide, make the vinylbenzene liquation in mass fraction; 10 parts of solution and 90 parts of strontium ferrite magnetic powders handling through previous step are mixed, make suspension system; Suspension system is heated to 100 ℃ in nitrogen, is incubated 5 hours, make styrene monomer generate polystyrene in the polymerization of magnetic surface in situ.At last, utilize single screw extrusion machine, prepare described strontium ferrites powder-polystyrene built-up magnet 190 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that polystyrene is coated.
Embodiment 9
In mass fraction, 3 parts KH570 and 100 parts of strontium ferrite magnetic powders are mixed the back thorough drying, magnetic is carried out the surface coat processing.Subsequently,, in 100 parts of methyl methacrylates, add 7 parts dibenzoyl peroxide, make the methyl methacrylate monomer liquation in mass fraction; 10 parts of solution and 90 parts of strontium ferrite magnetic powders handling through previous step are mixed, make suspension system; Suspension system is heated to 100 ℃ in nitrogen, is incubated 6 hours, make methyl methacrylate monomer generate polymethylmethacrylate in magnetic generation surface in situ polyreaction.At last, utilize single screw extrusion machine, prepare described strontium ferrites powder-polymethylmethacrylate built-up magnet 190 ℃ of magnetic directly extrusion mouldings under the effect of 1000kA/m alignment magnetic field that polymethylmethacrylate is coated.
Claims (5)
1, a kind of preparation method of permanent magnet iron oxygen body polymer composite magnet is characterized in that comprising the steps and processing condition:
The first step in mass fraction, mixes the back thorough drying with 3～6 parts coupling agents and 100 parts of strontium ferrite magnetic powders, magnetic is carried out the surface coat processing;
In second step, in mass fraction, fine or 7～8 parts of dibenzoyl peroxide join in 100 parts of polymer monomers with 6～7 parts of azo two isobutyls, make monomer solution; And with 10 parts of monomer solutions with handle through the first step after strontium ferrite magnetic powder mix for 90 parts, make suspension system, then suspension system is heated to 65～100 ℃ in nitrogen, be incubated 4～8 hours, make monomer home position polymerization reaction take place and generate polymkeric substance, realize the uniform mixing of magnetic and polymkeric substance on the magnetic surface;
In the 3rd step,, prepare described permanent magnet iron oxygen body polymer composite magnet with magnetic directly extrusion moulding under the effect of 1000kA/m alignment magnetic field of twin screw or single screw extruder with polymer overmold;
Described coupling agent comprises a kind of among silane resin acceptor kh-550, KH-560 and the KH-570; Described polymer monomer comprises methyl methacrylate, methyl methacrylate glycidyl ester, butyl acrylate, vinylbenzene.
2, according to the preparation method of the described a kind of permanent magnet iron oxygen body polymer composite magnet of claim 1, it is characterized in that described second the step comprise: in mass fraction, 6～7 parts of dibenzoyl peroxide are joined in 100 parts of methyl methacrylates, make methyl methacrylate monomer solution; And with 10 parts of monomer solutions with handle through the first step after strontium ferrite magnetic powder mix for 90 parts, make suspension system, then suspension system is heated to 90～100 ℃ in nitrogen, be incubated 6～8 hours, make monomer home position polymerization reaction take place and generate polymethylmethacrylate, realize the uniform mixing of magnetic and polymkeric substance on the magnetic surface.
3, according to the preparation method of the described a kind of permanent magnet iron oxygen body polymer composite magnet of claim 1, it is characterized in that, described second step comprises: in mass fraction, with 6～7 parts of fine joining in 100 parts of methyl methacrylate glycidyl ester monomer of azo two isobutyls, make monomer solution; And with 10 parts of monomer solutions with handle through the first step after strontium ferrite magnetic powder mix for 90 parts, make suspension system, then suspension system is heated to 70～80 ℃ in nitrogen, be incubated 5～7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethylmethacrylate glycidyl ester, realize the uniform mixing of magnetic and polymkeric substance on the magnetic surface.
4, according to the preparation method of the described a kind of permanent magnet iron oxygen body polymer composite magnet of claim 1, it is characterized in that, described second step comprises: in mass fraction, join in 100 parts of butyl acrylates in the monomer 6～7 parts of azo two isobutyls are fine, make monomer solution; And with 10 parts of monomer solutions with handle through the first step after strontium ferrite magnetic powder mix for 90 parts, make suspension system, then suspension system is heated to 65～80 ℃ in nitrogen, be incubated 4～5 hours, make Butyl Acrylate Monomer generate butyl polyacrylate, realize the uniform mixing of magnetic and polymkeric substance in the polymerization of magnetic surface in situ.
According to the preparation method of the described a kind of permanent magnet iron oxygen body polymer composite magnet of claim 1, it is characterized in that 5, described second step comprises: in mass fraction, 7～8 parts of dibenzoyl peroxide are joined in 100 parts of styrene monomers, make monomer solution; And with 10 parts of monomer solutions with handle through the first step after strontium ferrite magnetic powder mix for 90 parts, make suspension system, then suspension system is heated to 90～100 ℃ in nitrogen, be incubated 5～6 hours, make styrene monomer generate polystyrene, realize the uniform mixing of magnetic and polymkeric substance in the polymerization of magnetic surface in situ.
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| CNB2005100345582A CN1314748C (en) | 2005-05-11 | 2005-05-11 | Process for preparing permanent magnet iron oxygen body polymer composite magnet |
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| CNB2005100345582A CN1314748C (en) | 2005-05-11 | 2005-05-11 | Process for preparing permanent magnet iron oxygen body polymer composite magnet |
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| CN102964539B (en) * | 2012-10-19 | 2016-05-25 | 南京林业大学 | The preparation method of porous magnetic polystyrene microsphere |
| CN106750974A (en) * | 2016-12-31 | 2017-05-31 | 东莞市淦宏信息科技有限公司 | A kind of production technology of conductive agglomerate |
| CN106750973A (en) * | 2016-12-31 | 2017-05-31 | 东莞市淦宏信息科技有限公司 | A kind of production technology of improved conductive agglomerate |
| CN107393709B (en) * | 2017-07-02 | 2019-02-01 | 北京科技大学 | A kind of method that isostatic cool pressing prepares high-orientation anisotropic bonded magnet |
| CN107383291A (en) * | 2017-08-02 | 2017-11-24 | 四川省蓝扬科技有限公司 | It is a kind of to stablize environment-friendly water-based pigment and preparation method thereof |
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| CN1429858A (en) * | 2002-12-27 | 2003-07-16 | 北矿磁材科技股份有限公司 | High-performance magnetic rubber and its preparation method |
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| CN1429858A (en) * | 2002-12-27 | 2003-07-16 | 北矿磁材科技股份有限公司 | High-performance magnetic rubber and its preparation method |
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